check_ntp_time offset unknown

[Bennett, Jan]

We have implemented a NTP sync check in all of the NRDS checks that we are rolling out right now but I've run into a bit of a snag.

I am getting returns of 'Offset Unknown' on all clients.  It appears to only happen for a short period of time (30 min or so) and then it will clear its self up for a bit but the issue will always return.

>From the client that is reporting the unknown offset, I can run the following:

# ./check_ntp_time -H localhost
NTP CRITICAL: Offset unknown|
# ./check_ntp_time -V
check_ntp_time v1.4.16 (nagios-plugins 1.4.16)
# ntpdc -p
     remote           local      st poll reach  delay   offset    disp
=======================================================================
=LOCAL(0)        127.0.0.1       10   64   17 0.00000  0.000000 0.96858
*timeserver1     xxx.xxx.xxx.xxx    2   64   17 0.00098  4.956048 0.00580
# /usr/local/nagios/libexec/check_ntp_time -v -H localhost
sending request to peer 0
response from peer 0: offset -2.777669579e-07
sending request to peer 0
response from peer 0: offset -2.161832526e-07
sending request to peer 0
response from peer 0: offset -4.009343684e-07
sending request to peer 0
response from peer 0: offset -1.987209544e-07
discarding peer 0: stratum=0
overall average offset: 0
NTP CRITICAL: Offset unknown|

In my searches, I noticed a number of people reporting the same issue with the supposed solution being to update your Nagios plugins to 1.4.13.  I have done so and am now running 1.4.16 without any change in the service check.

Also, I am unable to check a remote NTP server from these clients as they do not have access to the outside world.

It has been suggested that the stratum=0 may be the culprit, but I'm not sure of my options here.

Any help would be greatly appreciated.

Jan

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